Transitional image for a portion of a display screen



FIG. 1 is a front view of the first image of a transitional image for a portion of a display screen showing our new design; and,

FIG. 2 is a front view of the second image thereof.

The appearance of the image transitions sequentially between the images shown in FIGS. 1-2. The process or period in which the first image transitions to the other forms no part of the claimed design. The broken line drawing of a display screen in both views is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a transitional image for a portion of a display screen, as shown and described. 